21195113 has 2 divisors, whose sum is σ = 21195114. Its totient is φ = 21195112.

The previous prime is 21195091. The next prime is 21195131. The reversal of 21195113 is 31159112.

Together with next prime (21195131) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 18593344 + 2601769 = 4312^2 + 1613^2 .

It is a cyclic number.

It is not a de Polignac number, because 21195113 - 2⁶ = 21195049 is a prime.

It is not a weakly prime, because it can be changed into another prime (21195313) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10597556 + 10597557.

It is an arithmetic number, because the mean of its divisors is an integer number (10597557).

Almost surely, 2^21195113 is an apocalyptic number.

It is an amenable number.

21195113 is a deficient number, since it is larger than the sum of its proper divisors (1).

21195113 is an equidigital number, since it uses as much as digits as its factorization.

21195113 is an evil number, because the sum of its binary digits is even.

The product of its digits is 270, while the sum is 23.

The square root of 21195113 is about 4603.8150484137. The cubic root of 21195113 is about 276.7442325379.

The spelling of 21195113 in words is "twenty-one million, one hundred ninety-five thousand, one hundred thirteen".